Recieved same call today - called back, asked who he was, couldn't understand, then said i want proof that he is from the IRS - he said local sheriff will contact me in 20 minutes.
Got a robotic call at 9:50 this morning 4/6/15. Message stated that my case would be turned over to the county court house. I noticed the call was initiated in New York. Be careful out there. This is tax return time and they are preying upon the misinformed. This was a fake. Never call suspicious numbers back, always try to Google them and it will confirm your suspicions!
Still at it.. got 1/2 of a robocall with the current NY number, I'm assuming it was the same BS. Didn't call back, don't care to let them know they have a live one.